7122/7-3
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General information
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Wellbore history
GeneralWell 7122/7-3 was drilled on the Goliat Field, which is located approximately 55 km to the south-east of the Snøhvit Field. The Goliat structure is located on the crestal part of a major northeast-southwest trending roll-over anticline situated in the southeastern part of the Hammerfest Basin, along the Troms-Finmark Fault. The primary purpose of the well was to appraise the hydrocarbon potential of the Early Jurassic / Late Triassic (the 7122/7-1 Goliat Discovery). The secondary purpose was to test the potential throughout the Triassic and Late Permian. Permian was the drilling commitment for the licence.Operations and resultsWell 7122/7-3 was spudded with the semi-submersible installation Eirik Raude on 24 October 2005 and drilled to TD at 2726 m in limestone/claystone of the Late Permian Røye Formation. No serious problem was encountered in the operations. The well was drilled with seawater/high viscous sweeps with pre-hydrated bentonite mud down to 538 m and with K/Na Format Polymer mud from 538 m to TD.The top of the Tubåen reservoir was found at 1087 m, 5 m deeper than prognosis. The reservoir had a gas cap with a GOC at 1145.6 m and oil below. No OWC was found. Top Snadd Formation reservoir was encountered at 1180 m, 23 m shallower than prognosis. The reservoir was oil bearing with a true OWC at 1199.5 m and was in a pressure regime different from the Tubåen reservoir pressure. The third reservoir was found in the Kobbe Formation at 1808 m, 29 m shallower than the prognosis. The reservoir was oil bearing. Oil was confirmed down to 1875.3 m by MDT fluid scanning, and the oil water contact was interpreted to be at 1878 m based on intersection between oil and water gradients.The Kobbe Formation oil differs from the upper Tubåen and Snadd oils, which are geochemically very similar. The Kobbe oil is not biodegraded while the upper oil reservoirs are slightly biodegraded (removal of C8 ? C15 n-alkanes, but intact C15+ n-alkanes). Other geochemical differences, such as a very light stable carbon isotope composition in the Kobbe oil compared to the upper oils, indicate that the Kobbe oil and the upper oils have different source rocks.Seven cores were cored in the well. Cores 1 and 2 were cut from 1082 to 1104 from the Late Jurassic Fuglen Formation and into the Late Triassic Kap Toscana Group, core 3 was cut from 1146.5 to 1156 m in the Kap Toscana Group, core 4 was cut from 1187 to 1192 m in the Late Triassic Snadd Formation, cores 5 and 6 were cut from 1812 to 1836 m in the Middle Triassic Kobbe Formation, and core 7 was cut from 2519 to 2521 m in the Early Triassic Havert Formation. MDT fluid samples were taken at 1095.3 m (Tubåen Formation ; gas), 1148.5 m (Tubåen Formation; oil), 1195.6 m (Snadd Formation; oil), 1202.1 m (Snadd Formation; water), 1812 m (Kobbe Formation; oil), 1874.5 m (Kobbe Formation; oil), and at 1931.2 m (Kobbe Formation; water).The well was permanently abandoned on 8 January 2006 as a discovery well.TestingNo drill stem test was performed. -
Cuttings at the Norwegian Offshore Directorate
Cuttings at the Norwegian Offshore Directorate Cuttings available for sampling?YESCuttings at the Norwegian Offshore Directorate Cutting sample, top depth [m]Cutting samples, bottom depth [m]540.002725.00 -
Cores at the Norwegian Offshore Directorate
Cores at the Norwegian Offshore Directorate Core sample numberCore sample - top depthCore sample - bottom depthCore sample depth - uom11082.01085.3[m ]21086.01105.0[m ]31146.01156.8[m ]41187.01189.5[m ]51812.01823.2[m ]61824.01834.3[m ]72519.02520.9[m ]Cores at the Norwegian Offshore Directorate Total core sample length [m]58.9Cores at the Norwegian Offshore Directorate Cores available for sampling?YES -
Oil samples at the Norwegian Offshore Directorate
Oil samples at the Norwegian Offshore Directorate Test typeBottle numberTop depth
MD [m]Bottom depth
MD [m]Fluid typeTest timeSamples availableMDT0.001195.6030.11.2005 - 00:00YESMDT1812.000.0017.12.2005 - 00:00YES -
Casing and leak–off tests
Casing and leak–off tests Casing typeCasing diam.
[inch]Casing depth
[m]Hole diam.
[inch]Hole depth
[m]LOT/FIT mud eqv.
[g/cm3]Formation test typeCONDUCTOR30416.036421.00.00LOTSURF.COND.20529.026530.01.35LOTSURF.COND.13 3/8995.0161000.02.62LOTINTERM.9 5/81694.012 1/41712.01.19LOTLINER72405.08 1/22420.00.00LOTOPEN HOLE2726.062726.00.00LOT -
Logs
Logs Log typeLog top depth [m]Log bottom depth [m]- LEHQT ECRD16932409- LEHQT ECRO9951714CMR HLRA TLO HGNS ECS HWGS ACTS9951714CMR HRLA TLD HGNS ECS HNGS ACTS16932409CMR PPC GR ACTS9951712DSI HRLA TLD HGNS ACTS ECRD23502727FMI PPC GR ACTS9951714LWD - GR RES DIR524989LWD - GR RES DIR ECD10002415MDT GR ACTS ACRD18082206MDT GR ACTS ECRD10001700MDT GR ACTS ECRD23502727MDT GR ACTS ECRD DUAL PACKER11481195MSCT GR11051653MSCT GR17192381MSIP DENS GR CAL4771001MSIP FMI PPPC GR ACTS16932410VSP GR8502721 -
Lithostratigraphy
Lithostratigraphy Top depth [mMD RKB]Lithostrat. unit3686346346506508659601018107310871087118018081808204422122595 -
Composite logs
Composite logs Document nameDocument formatDocument size [MB]pdf0.40 -
Geochemical information
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Drilling mud
Drilling mud Depth MD [m]Mud weight [g/cm3]Visc. [mPa.s]Yield point [Pa]Mud typeDate measured3721.03SPUD MUD4001.2519.0FORMATE POLYMER5381.2012.0FORMPRO9001.2012.0FORMATE POLYMER10561.3012.0FORMATE POLYMER12301.3015.0FORMATE POLYMER17121.3415.0FORMATE POLYMER18161.3614.0FORMATE POLYMER24201.5421.0FORMATE POLYMER25401.5517.0FORMATE POLYMER27261.5419.0FORMATE POLYMER -
Palynological slides at the Norwegian Offshore Directorate
Palynological slides at the Norwegian Offshore Directorate Sample depthDepth unitSample typeLaboratory1082.3[m]CICHRON1083.3[m]CICHRON1086.5[m]CICHRON1087.0[m]CICHRON1149.5[m]CICHRON1151.5[m]CICHRON1154.7[m]CICHRON1156.6[m]CICHRON1187.1[m]CICHRON1189.5[m]CICHRON1814.7[m]CICHRON1816.2[m]CICHRON1822.6[m]CICHRON1824.4[m]CICHRON1831.6[m]CICHRON1832.9[m]CICHRON1833.3[m]CICHRON -
Thin sections at the Norwegian Offshore Directorate
Thin sections at the Norwegian Offshore Directorate DepthUnit1087.80[m ]1813.25[m ]1818.25[m ]1828.75[m ]1819.02[m ]1826.45[m ]